CVE-2001-1217 in Application Server
Summary
by MITRE
Directory traversal vulnerability in PL/SQL Apache module in Oracle Oracle 9i Application Server allows remote attackers to access sensitive information via a double encoded URL with .. (dot dot) sequences.
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Analysis
by VulDB Data Team • 06/11/2024
The vulnerability described in CVE-2001-1217 represents a critical directory traversal flaw within the PL/SQL Apache module of Oracle 9i Application Server. This security weakness stems from inadequate input validation mechanisms that fail to properly sanitize URL parameters containing double-encoded .. (dot dot) sequences. The vulnerability exists at the application layer where the web server processes user-supplied URLs without sufficient sanitization, allowing malicious actors to manipulate file paths and access restricted system resources. The issue specifically affects the PL/SQL module which serves as a bridge between the Apache web server and Oracle database functionality, creating a potential attack vector that spans both web server and database security domains.
The technical exploitation of this vulnerability occurs when an attacker crafts a specially formatted URL that contains double-encoded directory traversal sequences. These sequences bypass standard input validation checks by appearing as encoded characters in the URL, which then get decoded by the web server before being processed by the PL/SQL module. The module fails to properly normalize or validate these decoded sequences, allowing the traversal logic to interpret the .. (dot dot) references as legitimate path navigation commands. This flaw enables attackers to navigate beyond the intended document root directory and access sensitive files such as configuration files, database connection details, source code, or other system resources that should remain protected from external access. The vulnerability is particularly dangerous because it leverages the web server's normal operation to achieve unauthorized file access rather than requiring direct system-level exploitation.
The operational impact of this directory traversal vulnerability extends beyond simple information disclosure to potentially compromise entire application server environments. Attackers can leverage this weakness to access critical system files including password files, configuration settings, application source code, and database connection strings that may contain administrative credentials. The exposure of such sensitive information can lead to further exploitation opportunities including privilege escalation, database access, and potential full system compromise. Additionally, the vulnerability affects the integrity of the application server's security model by allowing unauthorized access to resources that should be protected within the server's designated boundaries. Organizations running Oracle 9i Application Server are particularly vulnerable as this flaw exists in the core web server functionality that handles all incoming HTTP requests and processes PL/SQL-based applications.
Security professionals should address this vulnerability through immediate patching of affected Oracle 9i Application Server installations, as Oracle released specific security updates to resolve the directory traversal issue in their PL/SQL module. Network segmentation and access controls should be implemented to limit exposure of the affected servers to untrusted networks, while web application firewalls can be configured to detect and block suspicious URL patterns containing directory traversal sequences. Input validation should be strengthened at the application level to ensure all URL parameters are properly sanitized before processing, implementing proper path normalization and validation routines. Organizations should also conduct thorough security assessments of their web applications to identify similar vulnerabilities in other components and implement comprehensive monitoring for suspicious access patterns that may indicate exploitation attempts. This vulnerability aligns with CWE-22 Directory Traversal and follows patterns commonly associated with attack techniques documented in the ATT&CK framework under T1083 File and Directory Discovery, emphasizing the importance of proper input validation and access control mechanisms in web server configurations.